“Last week the BP Whiting tar sands refinery in Indiana dumped crude oil into Lake Michigan,” says Michael Marx, Sierra Club beyond oil campaign director. “Expanding the Alberta Clipper tar sands pipeline would move towards more dirty, dangerous tar sands crude through the region, which would put American and Tribal lands and waters, including the Great Lakes, at risk of more devastating oil spills.”

The Alberta Clipper pipeline, also known as Line 67, currently pumps up to 450,000 barrels per day of tar sands crude from Hardisty, Alberta, Canada, to Superior, Wisconsin. The pipeline traverses 327 miles through North Dakota and Minnesota to Wisconsin and the shores of Lake Superior, passing through Tribal lands, forests, farms, rivers, and lakes. Enbridge, the company that owns the pipeline, seeks to almost double the pipeline’s capacity to 800,000 bpd, nearly the same as TransCanada’s controversial Keystone XL pipeline; and to construct two new tar sands storage tanks on the shores of Lake Superior.

“Higher capacity means more crude pumped at higher temperature and pressure, raising the risk of accidents,” says Sarah Milne, report author. “This proposal would also enable tar sands industry growth, generating massive carbon pollution at a time when both the U.S. and Canada must transition away from dirty fuels and to renewable energy.”

“Enbridge has a disgraceful history of spills and has been cited for safety violations by U.S. and Canadian public safety agencies,” says Milne. “From 1999 to 2010, Enbridge was responsible for more than 800 spills that released 6.8 million gallons of hydrocarbons, including the worst onshore oil spill in U.S. history, the 2010 Kalamazoo River disaster.”